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Inhomogeneity problem with a sliding interface under remote shearing stress

Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2122-2127页

作者： ZHAO YingTao GAO Yang WANG MinZhong Department of Mechanics School of Aerospace EngineeringBeijing Institute of TechnologyBeijing 100081China College of Science China Agricultural UniversityP.O.Box 74Beijing 100083China State Key Laboratory for Turbulence and Complex Systems and Department of Mechanics and Aerospace Engineering College of EngineeringPeking UniversityBeijing 100871China

The problem of an ellipsoidal inhomogeneity embedded in an infinitely extended elastic medium with sliding interfaces is investigated. An exact solution is presented for such an inhomogeneous system that is subject to remote uniform shearing stress. Both the elastic inclusion and matrix are considered isotropic with a separate elastic modulus. Based on Lur’e’s approach to solving ellipsoidal cavity problems through Lamé functions, several harmonic functions are introduced for Papkovich-Neuber displacement potentials. The displacement fields inside and outside the ellipsoidal inclusion are obtained explicitly, and the stress field in the whole domain is consequently determined.

关键词： inhomogeneity sliding interface Lamé’s function Eshelby problem

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Numerical Prediction of Hydrodynamic Forces on A Ship Passing Through A Lock

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China Ocean Engineering 2014年第3期28卷 421-432页

作者：王宏志邹早建 School of Naval Architecture Ocean & Civil Engineering Shanghai Jiao Tong University State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

While passing through a lock, a ship usually undergoes a steady forward motion at low speed. Owing to the size restriction of lock chamber, the shallow water and bank effects on the hydrodynamic forces acting on the ship may be remarkable, which may have an adverse effect on navigation safety. However, the complicated hydrodynamics is not yet fully understood. This paper focuses on the hydrodynamic forces acting on a ship passing through a lock. The unsteady viscous flow and hydrodynamic forces are calculated by applying an unsteady RANS code with a RNG k-e turbulence model. User-defined function （UDF） is compiled to define the ship motion. Meanwhile, the grid regeneration is dealt with by using the dynamic mesh method and sliding interface technique. Numerical study is carried out for a bulk carrier ship passing through the Pierre Vandamme Lock in Zeebrugge at the model scale. The proposed method is validated by comparing the numerical results with the data of captive model tests. By analyzing the numerical results obtained at different speeds, water depths and eccentricities, the influences of speed, water depth and eccentricity on the hydrodynamic forces are illustrated. The numerical method proposed in this paper can qualitatively predict the ship-lock hydrodynamic interaction. It can provide certain guidance on the manoeuvring and control of ships passing through a lock.

关键词： ship-lock hydrodynamic interaction numerical simulation dynamic mesh sliding interface

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